Steam-pump



(NoModel.) s sheets-sheet 1.

E. C. JOHNSON.

STEAM PUMP. l No. 502,043. Patentd July 25, 1893.

(No Model.) 3 ,sheets-sheet s o. JOHNSON. y

STEAM PUMP'.

l y No.5o2,043. I Patented'Ju1y25,1893Q NrTnD STATES PATENT OFFICE.

EDWARD O. JOHNSON, OF KEOKUK, IOWA.

STVEAM- PU'NI P.

SPECIFICATION forming part of Letters Patent No. 502,043, dated July 25, 1893.

Application led January 16, 1891. Serial No. 377,975. (No model.)

To @ZZ whom it may concern,.-

Beit known that I, EDWARD C. JOHNSON, residing at Keokuk, in the county ot' Lee and State of Iowa, havenvented certain new and useful Improvements in Steam ,-Pumps, of which the following is a specification, reference being had therein` to the accompanying drawings.

This invention relates to steam pumps of the general character known as cycloidal or gyrating pumps.V

The object of the invention is to improve the construction of the pumps of the class described, so that the relative pressures of steam and water may be made to conform to the conditions of use; also to generallyimprove the construction of pumps. Y

In high service pumps it frequently becomes necessary to work against a pressure of several hundred feet of water, while it may not be convenient or desirable to carry a high steam'pressure. Consequently it becomes desirable to balance the steam piston by steam pressure and the water piston by water pressure.

Figure 1 is a vertical section of a steam pump involving the improved construction, the section being taken on the broken line Fig. 5. Fig. 2 is a bottom plan of the central cover of the water piston, showing the springs which rest on the packing. Fig. 3 is a top plan of the pump, with the cover of the water piston removed. Fig. Llis a side elevation partly sectioned of'the water piston cover and packing. Fig. 5 is a plan view of the steam and water cylinders with covers removed, one position of the piston rings being indicated in dotted lines. Fig. 6 is a side elevation of the steam piston, and a broken section of the cover thereof, showing link guide for piston. Fig. 7 is a side elevation of water piston.

The numeral 1 indicates the bottom plate of the engine. This may be a disk or other plate with legs 2, 2, or any other suitable supports. The plate 1 is preferably cut away at 3, 3, to give annular packing surfaces or joints,

instead of a single surface, thereby lighten-k ing the metal and making better joints.

The bottom plate 1 supports the central water cylinder 4. This cylinder has an outer ring 5, an inner concentric ring or hollow hub 6, and a connecting radial partition 7. The chamber 8 between the rings 5 and 6 does not extend to the lower end of the cylinder 4, but a disk or bottom 9 cuts off the lower part of the cylinder, save where openings or ports 10 and 11 are provided through this bottom 9 The ring 5 is made with a broad bearing at top, and is undercut to reduce weight.

Below the bottom 9 but above the plate 1 there are chambers 12 and 13, connecting to the ports 10 and 1l. One of these chambers 12 receives a water supply from the supply pipe or passage l5. The other chamber 13 is a basis for connecting the delivery pipe 16, which leads away from the pump. The piston 20 has 'a dat ring 21 which tits on top of the two rings 5 and 6, and is broad enough to cover the space between said rings, when shifted from side to side, as about to be described.

A broken ring flange 22 projects from the flat face of ring 21, and extends down into the chamber 8, so that the lower edge of the ring rests on the floor 9, while the ring 21 rests on the top of the cylinder rings 5 and 6, the break in the flange 22 straddling the annular partition 7. The broken ring or iiange 22 is of such diameter, (as shown in dotted lines, Fig. 5) that the inner side of the flange 22 at one side of the pump will rest against the outside of the hub 6, while the outside of in water through port 1Q, and expels it from port 11, with each swing or impulse of the piston. The disk or ring 21 rests on the top of the rings 5 and 6, and flange 22 rests against the bottom 9 of chamber 8, with close joints.

To secure the seating of the piston in the cylinder, a passage 25 from the escape pipe or from chamber 13, extends th rough the central vsaid ange rests against the inner face of ring IOO hub, and so up through the ring 21 ot the piston. A rod 30 is firmly secured in the central hub, and extends up through the cap or cover 31. A disk 32 serves to center the rod in the hub, said disk 32 being perforated for the passage of water. The cap or cover 31 is a little less in diameter than the ring 2l, and a chamber 34 is left between the cap and the ring or plate 21. An annular flange 35, at the edge of cap 31, extends down nearly to the ring 2l. Just inside this ring there is a ring packing 3G, held down by springs 37, between the packing and cover in addition to the water pressure above said packing. The water from the delivery pipe thus has free entrance to the chamber 34, above the water `pistonp and bears `down on said piston with a pressure 1 proportioned to the area exposed to pressure.

The cover 31 has lugs 39, extending out to the inner edge of the main cover 80, for the purpose of centering and steadying this cover 31. The chamber 34 `may be made of such area as to give the desired excess of pressure on the upper side of the piston ring 21. I proportion the area of the bearing surface for downward pressure in chamber 34,1in such manner that any desired overbalance of pressure maybe produced to seat the piston. The same `is true of the steam piston, to be herei, inafter described. The cap 31 is held between i a collar 41 fon the rod 30, and the nut 33 on 5 said rod. Ot' course other means for ,holding i the coveror cap might `be adopted.

From the above description, it will be s een f that the Water piston and its cover can be removed from the pump, without disturbing the steam piston. ,Y The upper part of ring 2,1 is detachable, g and under this upperdetachable portion there ,i are recesses 44, two, three, or more in number, l which receive drivers 45, extending intocori responding recesses in the steam piston ring. L The recesses 44 are large enough to permit a; slight vertical play, so that the vertical ad; justment of the Water piston Vmay be `quitei independent of the steam piston, while the, driverswill cause the water piston to oscillate 5 with the steam piston. i, The steam cylinder has an annular ring base 50 resting on plate l, and surrounding the watercylinder. The base 50 has two coni centric rings 55and 56 connected also with, rings 5 and 6 and connected by a partition v57, l forming a chamber 58, which is annular exceptfor-the division by the partition 5,7. The 3 upper edge of ring 55 'is extended outward, `j and gthe turned up edge 560 of this outwardly extending rim forms a seat for the annulari steam piston cover S0. n At the side of the cylinder or casing nexti the partition 57 a steam inlet space 59 is E formed, and -an opening 60allows steam to;

A enter the annular chamber 5S next to this;

partition. A corresponding exhaust chaml ber or space 62 is located at the opposite side of the partition, and steam exhausts into the space and escapes by passages G3. The steam piston ring rests on top ot' the rings 55 and 56, and has an annular flange 72 extending down into the chamber 53, and broken to straddle the partition 57. The ring fiauge 72, indicated in dotted lines, Fig. 5,has the same eccentric relation to the cylinder rings or flanges 55 5G that the water piston has to its ring and hub, and the gyratory movement of the steam piston equals that of the Water piston. lhe ring cap vfinds its outer bearing 81 on the ange 560 and the inner edge of s aid cap rests on the piston ring 70, a packing ring 83 being preferably interposed between the cap and the piston, which ring is preferablya compound packing and is surmounted by springs, as has been described for ring 36.

This ring'cover 80 has box or recess 90, at the side of the pump which `has the partitions. This box is sim-ply an upward extension of `the `cover to `inclo'se the guiding link 91. The 4piston ring 70 hasan upwardly extending pin 92 above the partition 457, and the link 91 pivots on this pin, and pivots Vat the otherend on a pin 94iwhich l extends .down into the box 90. The link 91 being connected to the cover and to the steam piston, :prevents the flange 720ithe piston from touching the sides of partition 5,7. The gyratorymovement `ot' the 1piston is therefore not exactly from the partition, and the reciprocationof the piston is Anot exactly in a right line, but the slight curve of movement caused by A the L link is not material.

The pin 92supports a starting Vrod 95, which has aljoint 96 and extends through aistnfting Vbox 97 in the side of box `90, or of the cover 80. The rod may be Vmoved by alever 98,

which has a fulcrufm 99, on the casing, and engages a notch 100 in thestarting rod. 'llhe lever 98 may be moved by hand to throw the steam piston oli its dead point, whenever the piston stops on thedead center.

rllhe steam is admitted to chamber 58 close `to the partition 57and produces an `oscilla- `tory ,motion ot the iiange 72, .so as to .pass both inside and outside of said fiange. The gyratory motion ot' the steam piston is ,com- `niunicated to fthe water piston by -means ot' the `drivers 45.

The outer edge of rim 210i the `Water piston preferably fits close inside `the ringj70b1utias has been described the Vwater,piston,can'have a slight `vertical movement independently of the steam piston.

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The water `piston cover 31 is preferably l strengthened by ribs 300, as indicatedingdotted lines, Fig. 2. The ring cover SO is also strengthened by ribs SOO, and held down tothe `flange 560 of thesteam cylinder by bolts and nuts 801.

An oil cup 101 is located in the `box `90 above pin 92, and a lubricant from Lthis `cup will reach the joints around pin 9,2, and the `lubricant will also pass along a groove 93 in the upper surface of link91, and thus reach the pin 94.

A drip vpassage 102carries oft any leakage able center 92, and while the sides of the ring pistons 22 and 72 bear against the rings of the cylinder, the passages alongside the partitions 7 and 57 are always open, as the gap in the ring piston is wider thanl the thickness of the partitions. A passage 105 leads through the ring of the steam cylinder, so that there is always steam pressure above this piston to balance or overbalance the pressure from below the piston. The location of this passage is not material.

The ability to remove either the steam piston and cap or the water piston and cap without disturbing the remainder of the engine or pump isy an important advantage ofthe construction set forth. The caps andl packing determine the downward pressure to seat the pistons, as has been stated.

Byinclos'ing the water cylinder and its feed chambers within the steam cylinder, the device is rendered very compact.

The independent vertical adjustment of the two pistons is an important improvement -in construction.

1. In a steam pump, the steam cylinder, and water cylinder concentric therewith, and lannular steam and water pistons concentric with each other but separably connected, a ring cover for one piston and a cup cover for the other, and a single sliding guide from which the two pistons are guided, all in combination SAO substantially as described.

2. The combination with the water cylinder having broken annular chamber as described, of the ring piston having its ilange` inl said chamber, and a cover or cap of less diameter than the ring piston and removably connected to the water cylinder, substantially as described.

3. The combination of the water vcylinder with annular chamber and central hub, the

rod extending up from the hub, the ring piston having its flange in the annular chamber and open around said rod, and a cap or cover held by said rod and having its outer edge bearing by suitable packing on the upper surface of the water piston rihg, substantially as described. 4. The combination with a base, of the central Water cylinder having broken annular chamber with a floor thereto and inlet and outlet ports through said floor but above the base, the water piston in said cylinder, and a removable cap therefor, and a steam cylinder surroundin g said water cylinderbnt of greater ing piston therein, and a cap over the driving piston, and a steam cylinder having a broken annular steam chamber surrounding the Water cylinder and having a driving piston in said chamber and an annular cover therefor,

the caps and piston of the steam and water cylinders being separately removable, in combination substantially as described.

6. In a steam pump of the character described, the combination of a central water cylinder having broken annular chamber and piston, a surrounding steam cylinder of similar character and separate piston, and drivers separate from both pistons connecting the two pistons to cause them to partake of the same gyratory movement but to permit vertical movement independently of each other, substantially as described.

7. In a steam pump of the character described, the central Water piston having recesses in the edges thereof, the surrounding steam piston having similar recesses, and drivers separate from both pistons in said recesses connecting the two pistons but permitting independent vertical movement, and the cylinders and connections, all combined substantially as described.'

8. The combination with the central water cylinder, its piston, and a cap for said piston held down by a central rod extendingthrough the piston, of a packing ring interposed between the piston and cap, and springs bearing on the packing ring, all substantially as described.

9. The combination with the divided annular steam cylinder and piston, of a cap` above the same having a 'recess above the break in the piston, a pin extending up from the piston and a link connected to the same and to the cover and serving as a guide for the piston, and a starting bar connected to said guide pin and extending outside the casing, substantially as described.

10. The combination with the divided annular cylinder, piston, and cap, of a guide pin on the piston above the division in the flange thereof, a link connecting said pin to the cap, substantially as described and a starting bar connected to said guide pin and extending outside the casing,substantiallyas described.

11. The combination with the divided `annular steam piston, cylinder, and cap or cover, and pin projecting from the piston opposite 'the division thereof, of a starting bar connected to said pin and extending outsidethe easing, and a lever having a bearing on the casing and on the starting bar, substantially as described. v

12. The combination with the steam piston,

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cylinder, casing, and link guide, of ajlubril eating cup on the casing, anda passage along the link guide from Vsaid cup, whereby both 14.-. The combination with the cylinders,`

1o pistons, and annular cap over the steam piston, of the cap over the water cylinder se@ cured to a central support from the hiib thereof, said cap having side lugs to bear against and centerit in the annular cover to the steam piston. r 5

In testimony whereof I afx mysignature in presence of two Witnesses.

EDWARD c. JOHNSON.

Witnesses:

W. A. BARTLETT, T. W. JOHNSON. 

